python requests爬网页加速
import requestsreq = requests.get(url)一般用上述写法，访问网页久了会变卡，那么可以用下面方法替代session = requests.Session()req = session.get(url)也就是说，requests 让 Session对象能够保持连接：The Session object allows you to persist certain parameters across requests. It also persists
